/*
 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package com.sun.org.apache.xml.internal.security.keys.content;

import java.security.PublicKey;

import com.sun.org.apache.xml.internal.security.exceptions.XMLSecurityException;
import com.sun.org.apache.xml.internal.security.keys.content.keyvalues.DSAKeyValue;
import com.sun.org.apache.xml.internal.security.keys.content.keyvalues.RSAKeyValue;
import com.sun.org.apache.xml.internal.security.utils.Constants;
import com.sun.org.apache.xml.internal.security.utils.SignatureElementProxy;
import com.sun.org.apache.xml.internal.security.utils.XMLUtils;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

/**
 * The KeyValue element contains a single public key that may be useful in
 * validating the signature. Structured formats for defining DSA (REQUIRED)
 * and RSA (RECOMMENDED) public keys are defined in Signature Algorithms
 * (section 6.4). The KeyValue element may include externally defined public
 * keys values represented as PCDATA or element types from an external
 * namespace.
 *
 * @author $Author: coheigea $
 */
public class KeyValue extends SignatureElementProxy implements KeyInfoContent {

  /**
   * Constructor KeyValue
   */
  public KeyValue(Document doc, DSAKeyValue dsaKeyValue) {
    super(doc);

    XMLUtils.addReturnToElement(this.constructionElement);
    this.constructionElement.appendChild(dsaKeyValue.getElement());
    XMLUtils.addReturnToElement(this.constructionElement);
  }

  /**
   * Constructor KeyValue
   */
  public KeyValue(Document doc, RSAKeyValue rsaKeyValue) {
    super(doc);

    XMLUtils.addReturnToElement(this.constructionElement);
    this.constructionElement.appendChild(rsaKeyValue.getElement());
    XMLUtils.addReturnToElement(this.constructionElement);
  }

  /**
   * Constructor KeyValue
   */
  public KeyValue(Document doc, Element unknownKeyValue) {
    super(doc);

    XMLUtils.addReturnToElement(this.constructionElement);
    this.constructionElement.appendChild(unknownKeyValue);
    XMLUtils.addReturnToElement(this.constructionElement);
  }

  /**
   * Constructor KeyValue
   */
  public KeyValue(Document doc, PublicKey pk) {
    super(doc);

    XMLUtils.addReturnToElement(this.constructionElement);

    if (pk instanceof java.security.interfaces.DSAPublicKey) {
      DSAKeyValue dsa = new DSAKeyValue(this.doc, pk);

      this.constructionElement.appendChild(dsa.getElement());
      XMLUtils.addReturnToElement(this.constructionElement);
    } else if (pk instanceof java.security.interfaces.RSAPublicKey) {
      RSAKeyValue rsa = new RSAKeyValue(this.doc, pk);

      this.constructionElement.appendChild(rsa.getElement());
      XMLUtils.addReturnToElement(this.constructionElement);
    }
  }

  /**
   * Constructor KeyValue
   */
  public KeyValue(Element element, String BaseURI) throws XMLSecurityException {
    super(element, BaseURI);
  }

  /**
   * Method getPublicKey
   *
   * @return the public key
   */
  public PublicKey getPublicKey() throws XMLSecurityException {
    Element rsa =
        XMLUtils.selectDsNode(
            this.constructionElement.getFirstChild(), Constants._TAG_RSAKEYVALUE, 0);

    if (rsa != null) {
      RSAKeyValue kv = new RSAKeyValue(rsa, this.baseURI);
      return kv.getPublicKey();
    }

    Element dsa =
        XMLUtils.selectDsNode(
            this.constructionElement.getFirstChild(), Constants._TAG_DSAKEYVALUE, 0);

    if (dsa != null) {
      DSAKeyValue kv = new DSAKeyValue(dsa, this.baseURI);
      return kv.getPublicKey();
    }

    return null;
  }

  /**
   * @inheritDoc
   */
  public String getBaseLocalName() {
    return Constants._TAG_KEYVALUE;
  }
}
